/*
 *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_AUDIO_PROCESSING_NS_QUANTILE_NOISE_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_NS_QUANTILE_NOISE_ESTIMATOR_H_

#include <math.h>
#include <array>

#include "array_view.h"
#include "ns_common.h"

namespace webrtc {

    constexpr int kSimult = 3;

// For quantile noise estimation.
    class QuantileNoiseEstimator {
    public:
        QuantileNoiseEstimator();

        QuantileNoiseEstimator(const QuantileNoiseEstimator &) = delete;

        QuantileNoiseEstimator &operator=(const QuantileNoiseEstimator &) = delete;

        // Estimate noise.
        void Estimate(rtc::ArrayView<const float, kFftSizeBy2Plus1> signal_spectrum,
                      rtc::ArrayView<float, kFftSizeBy2Plus1> noise_spectrum);

    private:
        std::array<float, kSimult * kFftSizeBy2Plus1> density_{};
        std::array<float, kSimult * kFftSizeBy2Plus1> log_quantile_{};
        std::array<float, kFftSizeBy2Plus1> quantile_{};
        std::array<int, kSimult> counter_{};
        int num_updates_ = 1;
    };

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_NS_QUANTILE_NOISE_ESTIMATOR_H_
